Implement buzzer methods with AudioContext API

apps/buzzer-test/app.c

@@ -115,7 +115,7 @@ bool app_loop(void) {
             900,
         };
         application_state.play = false;
-        for(size_t i = 0; i < sizeof(rains); i++) {
+        for(size_t i = 0, count = sizeof(rains) / sizeof(rains[0]); i < count; i++) {
             char buf[9] = {0};
             if (rains[i] == BUZZER_NOTE_REST) {
                 printf("rest for %d ms\n", durations[i]);

make.mk

@@ -120,6 +120,7 @@ SRCS += \
   $(TOP)/watch-library/shared/driver/lis2dh.c \
   $(TOP)/watch-library/shared/driver/lis2dw.c \
   $(TOP)/watch-library/shared/driver/spiflash.c \
+  $(TOP)/watch-library/shared/watch/watch_private_buzzer.c \
   $(TOP)/watch-library/shared/watch/watch_private_display.c \
   $(TOP)/watch-library/shared/watch/watch_utility.c \
 
@@ -159,6 +160,7 @@ SRCS += \
   $(TOP)/watch-library/simulator/watch/watch_deepsleep.c \
   $(TOP)/watch-library/simulator/watch/watch_private.c \
   $(TOP)/watch-library/simulator/watch/watch.c \
+  $(TOP)/watch-library/shared/watch/watch_private_buzzer.c \
   $(TOP)/watch-library/shared/watch/watch_private_display.c \
   $(TOP)/watch-library/shared/watch/watch_utility.c \
 

rules.mk

@@ -13,6 +13,7 @@ endif
 $(BUILD)/$(BIN).html: $(OBJS)
 	@echo HTML $@
 	@$(CC) $(LDFLAGS) $(OBJS) $(LIBS) -o $@ \
+		-s ASYNCIFY=1 \
 		-s EXPORTED_FUNCTIONS=_main \
 		--shell-file=$(TOP)/watch-library/simulator/shell.html
 

watch-library/hardware/watch/watch_buzzer.c

@@ -47,10 +47,6 @@ inline void watch_set_buzzer_off(void) {
     gpio_set_pin_function(BUZZER, GPIO_PIN_FUNCTION_OFF);
 }
 
-// note: the buzzer uses a 1 MHz clock. these values were determined by dividing 1,000,000 by the target frequency.
-// i.e. for a 440 Hz tone (A4 on the piano), 1MHz/440Hz = 2273
-const uint16_t NotePeriods[108] = {18182,17161,16197,15288,14430,13620,12857,12134,11453,10811,10204,9631,9091,8581,8099,7645,7216,6811,6428,6068,5727,5405,5102,4816,4545,4290,4050,3822,3608,3405,3214,3034,2863,2703,2551,2408,2273,2145,2025,1911,1804,1703,1607,1517,1432,1351,1276,1204,1136,1073,1012,956,902,851,804,758,716,676,638,602,568,536,506,478,451,426,402,379,358,338,319,301,284,268,253,239,225,213,201,190,179,169,159,150,142,134,127};
-
 void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
     if (note == BUZZER_NOTE_REST) {
         watch_set_buzzer_off();

watch-library/shared/watch/watch_private_buzzer.c

@@ -0,0 +1,28 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "driver_init.h"
+
+// note: the buzzer uses a 1 MHz clock. these values were determined by dividing 1,000,000 by the target frequency.
+// i.e. for a 440 Hz tone (A4 on the piano), 1MHz/440Hz = 2273
+const uint16_t NotePeriods[108] = {18182,17161,16197,15288,14430,13620,12857,12134,11453,10811,10204,9631,9091,8581,8099,7645,7216,6811,6428,6068,5727,5405,5102,4816,4545,4290,4050,3822,3608,3405,3214,3034,2863,2703,2551,2408,2273,2145,2025,1911,1804,1703,1607,1517,1432,1351,1276,1204,1136,1073,1012,956,902,851,804,758,716,676,638,602,568,536,506,478,451,426,402,379,358,338,319,301,284,268,253,239,225,213,201,190,179,169,159,150,142,134,127};

watch-library/simulator/watch/watch_buzzer.c

@@ -24,37 +24,79 @@
 
 #include "watch_buzzer.h"
 
-inline void watch_enable_buzzer(void) {
-    // TODO: (a2) hook to UI
+#include <emscripten.h>
+
+static bool buzzer_enabled = false;
+static uint32_t buzzer_period;
+
+void watch_enable_buzzer(void) {
+    buzzer_enabled = true;
+    buzzer_period = NotePeriods[BUZZER_NOTE_A4];
+
+    EM_ASM({
+        Module['audioContext'] = new (window.AudioContext || window.webkitAudioContext)();
+    });
 }
-inline void watch_set_buzzer_period(uint32_t period) {
-    // TODO: (a2) hook to UI
+
+void watch_set_buzzer_period(uint32_t period) {
+    if (!buzzer_enabled) return;
+    buzzer_period = period;
 }
 
 void watch_disable_buzzer(void) {
-    _watch_disable_tcc();
+    buzzer_enabled = false;
+    buzzer_period = NotePeriods[BUZZER_NOTE_A4];
+
+    EM_ASM({
+        if (Module['audioContext']) {
+            Module['audioContext'].close();
+            Module['audioContext'] = null;
+        }
+    });
 }
 
-inline void watch_set_buzzer_on(void) {
-    // TODO: (a2) hook to UI
+void watch_set_buzzer_on(void) {
+    if (!buzzer_enabled) return;
+
+    EM_ASM({
+        const audioContext = Module['audioContext'];
+        if (!audioContext) return;
+
+        if (!(audioContext._oscillator && audioContext._gain)) {
+            const oscillator = audioContext.createOscillator();
+            const gain = audioContext.createGain();
+            oscillator.type = 'triangle';
+            oscillator.connect(gain);
+            gain.connect(audioContext.destination);
+            oscillator.start(0);
+
+            audioContext._oscillator = oscillator;
+            audioContext._gain = gain;
+        }
+
+        audioContext._oscillator.frequency.value = 1e6/$0;
+        audioContext._gain.gain.value = 1;
+    }, buzzer_period);
 }
 
-inline void watch_set_buzzer_off(void) {
-    // TODO: (a2) hook to UI
-}
+void watch_set_buzzer_off(void) {
+    if (!buzzer_enabled) return;
 
-// note: the buzzer uses a 1 MHz clock. these values were determined by dividing 1,000,000 by the target frequency.
-// i.e. for a 440 Hz tone (A4 on the piano), 1MHz/440Hz = 2273
-const uint16_t NotePeriods[108] = {0};
+    EM_ASM({
+        const audioContext = Module['audioContext'];
+        if (audioContext && audioContext._gain) {
+            audioContext._gain.gain.value = 0;
+        }
+    });
+}
 
 void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
     if (note == BUZZER_NOTE_REST) {
         watch_set_buzzer_off();
-    } // else {
-    //     hri_tcc_write_PERBUF_reg(TCC0, NotePeriods[note]);
-    //     hri_tcc_write_CCBUF_reg(TCC0, WATCH_BUZZER_TCC_CHANNEL, NotePeriods[note] / 2);
-    //     watch_set_buzzer_on();
-    // }
-    // delay_ms(duration_ms);
-    // watch_set_buzzer_off();
+    } else {
+        watch_set_buzzer_period(NotePeriods[note]);
+        watch_set_buzzer_on();
+    }
+    emscripten_sleep(duration_ms);
+    watch_set_buzzer_off();
 }

watch-library/simulator/watch/watch_deepsleep.c

@@ -35,6 +35,7 @@ static uint32_t watch_backup_data[8];
 
 void watch_register_extwake_callback(uint8_t pin, ext_irq_cb_t callback, bool level) {
     if (pin == BTN_ALARM) {
+        watch_enable_external_interrupts();
         watch_register_interrupt_callback(pin, callback, level ? INTERRUPT_TRIGGER_RISING : INTERRUPT_TRIGGER_FALLING);
     }
 }